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 Post subject: #35 vs. 35/51 tube
PostPosted: Jan Wed 10, 2018 1:38 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1342
Location: Wilton,IA
Working on a silvertone 1320 which has 3 #35s in
the front end.
#35s are virtually non-existant except for used/
not tested ones.
I do have some 35S/51S tubes. Would these sub in
for a straight 35?

I assume the S on the tube #s means shield, as they
have clamshell covers.

My RCA tube manual doesn't have a 51 listed. The
35 is a remote cutoff tetrode.
Looking on Google, the 51 is a screen grid tetrode.

Does any one have experience with these tubes?
Thanks.
Jim


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 Post subject: Re: #35 vs. 35/51 tube
PostPosted: Jan Wed 10, 2018 2:15 pm 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 23841
Location: Annapolis, MD
According to the RCA manual for the 35, it is equivalent to the 51

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 Post subject: Re: #35 vs. 35/51 tube
PostPosted: Jan Wed 10, 2018 2:58 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1342
Location: Wilton,IA
Much obliged, Mark.
Jim


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 Post subject: Re: #35 vs. 35/51 tube
PostPosted: Jan Wed 10, 2018 7:52 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 8023
Location: Long Island
I believe the 35 was developed by RCA while the 51 was developed by Sylvania. The specs were so close--practically identical in fact--that the two types were combined.

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 Post subject: Re: #35 vs. 35/51 tube
PostPosted: Jan Wed 10, 2018 9:39 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1342
Location: Wilton,IA
Thanks for that info, also, Chris.
Jim


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